package com.tedu.v3;

import java.io.*;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 *  Version3.0 升级  双向链接【客户端与服务器相互说话】
 */
public class Server {
    private ServerSocket serverSocket;
    public Server() {
        try {
            serverSocket=new ServerSocket(4545);
        } catch (BindException e){
            System.out.println("端口号重复申请，建议换个端口号");
        }catch (IOException e) {
            System.out.println("申请端口号失败....");
        }
    }
    public void start(){
        try {
            while(true){
                System.out.println("----等待客户端链接-----");
                Socket socket=serverSocket.accept();
                String ip=socket.getInetAddress().getHostAddress();
                System.out.println(ip+"一个客户端链接成功了");
                new Thread(new CS(socket)).start();
                }
        } catch (IOException e) {
            System.out.println("服务器端通讯断开了~");
        } finally {
            if(serverSocket!=null&&serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    System.out.println("服务器关闭失败~~");
                }
            }

        }
    }
    public static void main(String[] args) {
       new Server().start();
    }
    private  class CS implements  Runnable{
        private Socket socket;
        private String ip;
        public CS(Socket s){
            this.socket=s;
            ip=socket.getInetAddress().getHostAddress();
        }
        public void run() {
            PrintWriter pw=null;
           // BufferedReader br=null;
            try {
                //1.读入定义
                BufferedReader br=new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF8"));
                pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF8")), true);
           //1.1读入功能:存线程中
                new Thread(()->{
               try {
                   //2.1读入功能：①置空，不加，确定message一定读取数据
                        String message;
                        //②读取服务器发来的消息：读入一行不为空，一值有数据
                        //br.readLine()读取一行】
                        while((message=br.readLine())!=null){
                            System.out.println("客户端说："+message);
                            //增加写出一句话：读完卡住等待输入
                            System.out.println("服务器端请输入:");
                        }
                    } catch (IOException e) {
                        System.out.println("客户端读入失败~");
                    }
                }).start();
                //2.1提供写方法：控制台输入
                Scanner input=new Scanner(System.in);

                while(true){
                    System.out.println("服务器请输入：");
                String say=input.nextLine();//得到控制台输入值
                //打印：服务器端说的文本---打印客户端
                pw.println("服务器说："+say);
            }
            } catch (NullPointerException e){
                System.out.println("IO流传入对象，" +
                        "有对象为null！立马核对，" +
                         "建议：查看try块中对象可能赋值为null");
            } catch (UnsupportedEncodingException e) {
                System.out.println("客户端或者服务器端：字符集不一致");
            } catch (IOException e) {
                System.out.println("通讯过程中，传输出现错误！");
            } finally {
               if(pw!=null) {
                    pw.close();
                }
                if(serverSocket!=null&&serverSocket.isClosed()){
                    try {
                        serverSocket.close();
                    } catch (IOException e) {
                        System.out.println("服务器关闭失败~~");
                    }
                }
            }
        }
    }
}